Adaptive modulation and data embedding in light for advanced lighting control
a technology of adaptive modulation and light, applied in the direction of instruments, light sources, electroluminescent light sources, etc., can solve the problems of insufficient dimming range, insufficient data rate of lighting systems, and inability to optimize a given setup of different light sources, so as to achieve optimal system performance
Active Publication Date: 2012-12-11
SIGNIFY HLDG BV
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Benefits of technology
The present invention provides a control method and device for controlling the light output signal of a set of light sources that overcomes the drawbacks of prior art. The invention is based on the fact that the quality of the light output signal detection is dependent on the quality of the measurements performed at the detector. By adjusting the modulation signal based on the quality measure of the detection, the invention optimizes the performance of the system without adversely affecting the light properties. The invention can be used in various applications where the detection of individual information is important. The method and system provide an opportunity to keep the dimming range as large as possible while achieving reasonable conditions for detection and control. The set of light sources can be one or several light sources. The quality measure can be any parameter that affects the transmission link, such as signal-to-noise ratio, signal amplitude, and noise level. The method and system can be used in various lighting systems, such as LED lighting systems.
Problems solved by technology
They are not optimum for a given setup of different light sources.
That inherently decreases the dimming range, i.e. the range between the lowest possible and the highest possible intensity of the light output, and data rate of the lighting system to an unnecessarily high extent.
Method used
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[0039]Referring to FIG. 1 an exemplifying lighting system comprises four sets of light sources 1-4, which are mounted at the ceiling 5 of a structure, such as a room in a building. Each set consists of a single light source. The light sources 1-4 can be of any type which is dimmable and which offers the ability of being modulated in the way described herein. Typical examples of types are LED light sources, fluorescent lamps, high intensity discharge lamps, incandescent lamps and halogen lamps. They can be white or colored. For reasons of simplicity, below the four light sources 1-4 will be referred to as lamps. The lighting system further comprises a control system, which includes drive units 6-9, each one thereof connected with, and more particularly mounted within, a respective one of the lamps 1-4. The control system further comprises a detector device 10, below also called detector, and a master controller 11, below also called master. In this embodiment the detector 10 and the ...
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This invention relates to a method for controlling a light output signal emitted by a set of light sources comprising at least one light source, wherein said light output signal comprises a modulation signal which carries individual information, the method comprising recurrently: remotely detecting the light output signal of said set of light sources; determining at least one quality measure of said remote detection of the light output signal; and adjusting the modulation signal on basis of said at least one quality measure.
Description
FIELD OF THE INVENTION[0001]The present invention relates to a method for controlling the light output of a set of light sources comprising at least one light source, wherein a light output signal of the set of light sources is modulated by a modulation signal comprising individual information. Further, the present invention relates to a lighting system comprising a detector device and a master controller, which are arranged to control the light output in accordance with the method.BACKGROUND OF THE INVENTION[0002]In order to allow advanced control of a lighting system, devices and methods have been developed where the light output of each light source is modulated by a modulation signal. The modulation signal comprises individual information, such as an identification code or data regarding light source properties, etc. By thus providing each light output signal with such individual information it is possible to for instance remotely check the status of the light sources, or to fac...
Claims
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IPC IPC(8): H05B37/02
CPCH05B37/02H05B33/0851H05B45/10H05B47/19H05B47/165H05B47/155
Inventor SCHENK, TIM CORNEEL WILHELMUSFERI, LORENZOYANG, HONGMING
Owner SIGNIFY HLDG BV